[PATCH] nfsd: Allow read access over NFS to files with APPEND bit set.

Write access cannot safely be allowed as NFS doesn't support append, but read
access should be ok.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/vfs.c

@@ -656,12 +656,15 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 	dentry = fhp->fh_dentry;
 	inode = dentry->d_inode;
 
-	/* Disallow access to files with the append-only bit set or
-	 * with mandatory locking enabled
+	/* Disallow write access to files with the append-only bit set
+	 * or any access when mandatory locking enabled
 	 */
 	err = nfserr_perm;
-	if (IS_APPEND(inode) || IS_ISMNDLK(inode))
+	if (IS_APPEND(inode) && (access & MAY_WRITE))
 		goto out;
+	if (IS_ISMNDLK(inode))
+		goto out;
+
 	if (!inode->i_fop)
 		goto out;